Cnidaria is a phylum within Kingdom Animalia which consists of hydras, jellies (or jellyfish), sea anemones, and corals. All cnidarians are radially symmetrical, and there are two main radially symmetrical body types.
The stock market crash, on black Tuesday (October 29, 1929) began the Great Depression.
FDR Presidential Library & Museum. What was the Great Depression? The Great Depression  was a severe, world -wide economic disintegration symbolized in the United States by the stock market crash on Black Thursday, October 24, 1929 . The causes of the Great Depression were many and varied, but the impact was visible across the country. By the time that FDR was inaugurated president on March 4, 1933, the banking system had collapsed, nearly 25% of the labor force was unemployed, and prices and productivity had fallen to 1/3 of their 1929 levels.